Description

The Bently Nevada 21000-16-10-00-144-03-02, also cataloged as the 21000 Proximity Probe Housing, operates as a dedicated hardware component for mechanical encapsulation and environmental protection of proximity transducers within machinery casing pathways.

Suffix Breakdown & Model Matrix

The 21000 product code utilizes a standard seven-part variable matrix to define the precise mechanical dimensions and material properties of the housing assembly:

• 16 (Probe Option): 3300 XL 8 mm reverse mount probe with miniature coaxial connector.
• 10 (Probe Cable Length): 1.0 meter (39 inches) integrated lead cable.
• 00 (Standoff Adapter): No standoff adapter assembly installed.
• 144 (Probe Penetration): 14.4 inches (366 mm) overall sleeve extension depth, adjustable by plus or minus 0.5 inches.
• 03 (Fittings Option): Includes one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and one fluid-tight cable seal grip.
• 02 (Mounting Thread): 3/4-14 NPT physical casing mounting threads.

Hardware Specifications

Mechanical Protection and Rotor Dynamics Integrity

The rugged exterior shell isolates the sensitive transducer from internal process gases and lubricating oils. Consequently, the assembly preserves steady-state eddy-current probe scaling under high casing pressures, allowing accurate gap voltage validation (-10 VDC targets) across fluid-film bearings. Furthermore, the robust physical mounting structure delivers excellent cross-talk suppression by fixing the probe axis relative to the target shaft, mitigating stray vibrations and preventing high-amplitude rotor dynamics from causing structural resonance within the extended 14.4-inch measurement assembly itself.

Frequently Asked Questions

Q: Does the extended 14.4-inch sleeve length require additional structural mechanical stabilization?

A: Yes, sleeve penetration depths longer than 12.0 inches (304 mm) require an external sleeve support and oil seal framework (such as part number 37948-01). This structural reinforcement dampens cantilevered mechanical vibrations inside the machine case that could induce measurement noise.

Q: What is the mechanical adjustment range for setting the probe gap on this housing variant?

A: The mounting thread configuration allows a continuous physical adjustment stroke of plus or minus 0.5 inches (13 mm) along the longitudinal axis. Technicians utilize this travel distance to establish accurate proximity clearance relative to the shaft surface.

Field Installation Guidelines

• NPT Thread Engagement: Apply an approved industrial thread sealant to the 3/4-14 NPT interface and engage at least 5 full threads to maintain hazardous area containment parameters.
• Locknut Torque Specification: Torque the main sleeve positioning locknut to exactly 34 N-m to prevent depth slippage or rotational drift during heavy machine vibrations.
• Low-Temperature Boundary Limits: Ensure the installation environment does not drop below -34 deg C during active service, avoiding potential degradation or cracking of internal synthetic pressure seals.
• Conduit Routing Profile: Install the connecting electrical conduit loops with a continuous downward slope away from the housing entry port, allowing ambient condensed moisture to bypass the inner terminal connections.